1 files changed, 15 insertions, 201 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 64262bda8e54..22217fe2650b 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -27,10 +27,7 @@
 
 #include "mm.h"
 
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end;
+extern void _text, _etext, __data_start, _end, __init_begin, __init_end;
 extern unsigned long phys_initrd_start;
 extern unsigned long phys_initrd_size;
 
@@ -40,17 +37,6 @@ extern unsigned long phys_initrd_size;
  */
 static struct meminfo meminfo __initdata = { 0, };
 
-/*
- * empty_zero_page is a special page that is used for
- * zero-initialized data and COW.
- */
-struct page *empty_zero_page;
-
-/*
- * The pmd table for the upper-most set of pages.
- */
-pmd_t *top_pmd;
-
 void show_mem(void)
 {
         int free = 0, total = 0, reserved = 0;
@@ -173,57 +159,18 @@ static int __init check_initrd(struct meminfo *mi)
         return initrd_node;
 }
 
-/*
- * Reserve the various regions of node 0
- */
-static __init void reserve_node_zero(pg_data_t *pgdat)
+static inline void map_memory_bank(struct membank *bank)
 {
-        unsigned long res_size = 0;
-
-        /*
-         * Register the kernel text and data with bootmem.
-         * Note that this can only be in node 0.
-         */
-#ifdef CONFIG_XIP_KERNEL
-        reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
-#else
-        reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
-#endif
-
-        /*
-         * Reserve the page tables.  These are already in use,
-         * and can only be in node 0.
-         */
-        reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
-                             PTRS_PER_PGD * sizeof(pgd_t));
+#ifdef CONFIG_MMU
+        struct map_desc map;
 
-        /*
-         * Hmm... This should go elsewhere, but we really really need to
-         * stop things allocating the low memory; ideally we need a better
-         * implementation of GFP_DMA which does not assume that DMA-able
-         * memory starts at zero.
-         */
-        if (machine_is_integrator() || machine_is_cintegrator())
-                res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+        map.pfn = __phys_to_pfn(bank->start);
+        map.virtual = __phys_to_virt(bank->start);
+        map.length = bank->size;
+        map.type = MT_MEMORY;
 
-        /*
-         * These should likewise go elsewhere.  They pre-reserve the
-         * screen memory region at the start of main system memory.
-         */
-        if (machine_is_edb7211())
-                res_size = 0x00020000;
-        if (machine_is_p720t())
-                res_size = 0x00014000;
-
-#ifdef CONFIG_SA1111
-        /*
-         * Because of the SA1111 DMA bug, we want to preserve our
-         * precious DMA-able memory...
-         */
-        res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+        create_mapping(&map);
 #endif
-        if (res_size)
-                reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
 }
 
 static unsigned long __init
@@ -242,23 +189,18 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
          * Calculate the pfn range, and map the memory banks for this node.
          */
         for_each_nodebank(i, mi, node) {
+                struct membank *bank = &mi->bank[i];
                 unsigned long start, end;
-                struct map_desc map;
 
-                start = mi->bank[i].start >> PAGE_SHIFT;
-                end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT;
+                start = bank->start >> PAGE_SHIFT;
+                end = (bank->start + bank->size) >> PAGE_SHIFT;
 
                 if (start_pfn > start)
                         start_pfn = start;
                 if (end_pfn < end)
                         end_pfn = end;
 
-                map.pfn = __phys_to_pfn(mi->bank[i].start);
-                map.virtual = __phys_to_virt(mi->bank[i].start);
-                map.length = mi->bank[i].size;
-                map.type = MT_MEMORY;
-
-                create_mapping(&map);
+                map_memory_bank(bank);
         }
 
         /*
@@ -340,9 +282,9 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
         return end_pfn;
 }
 
-static void __init bootmem_init(struct meminfo *mi)
+void __init bootmem_init(struct meminfo *mi)
 {
-        unsigned long addr, memend_pfn = 0;
+        unsigned long memend_pfn = 0;
         int node, initrd_node, i;
 
         /*
@@ -355,26 +297,6 @@ static void __init bootmem_init(struct meminfo *mi)
         memcpy(&meminfo, mi, sizeof(meminfo));
 
         /*
-         * Clear out all the mappings below the kernel image.
-         */
-        for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-#ifdef CONFIG_XIP_KERNEL
-        /* The XIP kernel is mapped in the module area -- skip over it */
-        addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
-#endif
-        for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-
-        /*
-         * Clear out all the kernel space mappings, except for the first
-         * memory bank, up to the end of the vmalloc region.
-         */
-        for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
-             addr < VMALLOC_END; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-
-        /*
          * Locate which node contains the ramdisk image, if any.
          */
         initrd_node = check_initrd(mi);
@@ -407,114 +329,6 @@ static void __init bootmem_init(struct meminfo *mi)
         max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
 }
 
-/*
- * Set up device the mappings.  Since we clear out the page tables for all
- * mappings above VMALLOC_END, we will remove any debug device mappings.
- * This means you have to be careful how you debug this function, or any
- * called function.  This means you can't use any function or debugging
- * method which may touch any device, otherwise the kernel _will_ crash.
- */
-static void __init devicemaps_init(struct machine_desc *mdesc)
-{
-        struct map_desc map;
-        unsigned long addr;
-        void *vectors;
-
-        /*
-         * Allocate the vector page early.
-         */
-        vectors = alloc_bootmem_low_pages(PAGE_SIZE);
-        BUG_ON(!vectors);
-
-        for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
-                pmd_clear(pmd_off_k(addr));
-
-        /*
-         * Map the kernel if it is XIP.
-         * It is always first in the modulearea.
-         */
-#ifdef CONFIG_XIP_KERNEL
-        map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
-        map.virtual = MODULE_START;
-        map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
-        map.type = MT_ROM;
-        create_mapping(&map);
-#endif
-
-        /*
-         * Map the cache flushing regions.
-         */
-#ifdef FLUSH_BASE
-        map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
-        map.virtual = FLUSH_BASE;
-        map.length = SZ_1M;
-        map.type = MT_CACHECLEAN;
-        create_mapping(&map);
-#endif
-#ifdef FLUSH_BASE_MINICACHE
-        map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
-        map.virtual = FLUSH_BASE_MINICACHE;
-        map.length = SZ_1M;
-        map.type = MT_MINICLEAN;
-        create_mapping(&map);
-#endif
-
-        /*
-         * Create a mapping for the machine vectors at the high-vectors
-         * location (0xffff0000).  If we aren't using high-vectors, also
-         * create a mapping at the low-vectors virtual address.
-         */
-        map.pfn = __phys_to_pfn(virt_to_phys(vectors));
-        map.virtual = 0xffff0000;
-        map.length = PAGE_SIZE;
-        map.type = MT_HIGH_VECTORS;
-        create_mapping(&map);
-
-        if (!vectors_high()) {
-                map.virtual = 0;
-                map.type = MT_LOW_VECTORS;
-                create_mapping(&map);
-        }
-
-        /*
-         * Ask the machine support to map in the statically mapped devices.
-         */
-        if (mdesc->map_io)
-                mdesc->map_io();
-
-        /*
-         * Finally flush the caches and tlb to ensure that we're in a
-         * consistent state wrt the writebuffer.  This also ensures that
-         * any write-allocated cache lines in the vector page are written
-         * back.  After this point, we can start to touch devices again.
-         */
-        local_flush_tlb_all();
-        flush_cache_all();
-}
-
-/*
- * paging_init() sets up the page tables, initialises the zone memory
- * maps, and sets up the zero page, bad page and bad page tables.
- */
-void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
-{
-        void *zero_page;
-
-        build_mem_type_table();
-        bootmem_init(mi);
-        devicemaps_init(mdesc);
-
-        top_pmd = pmd_off_k(0xffff0000);
-
-        /*
-         * allocate the zero page.  Note that we count on this going ok.
-         */
-        zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
-        memzero(zero_page, PAGE_SIZE);
-        empty_zero_page = virt_to_page(zero_page);
-        flush_dcache_page(empty_zero_page);
-}
-
 static inline void free_area(unsigned long addr, unsigned long end, char *s)
 {
         unsigned int size = (end - addr) >> 10;